Right now
The most recent data we hold from NOAA arrived 1 minute ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
8 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 20 September 2026 at 16:15 UTC. It is kept here as a record.
It is the 17th strongest of the 54 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 20 at 5:12AM CDT until September 20 at 11:15AM CDT by NWS Quad Cities IA IL
Urban PEI: 264,706 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- September 20, 2026 · score 37 · 0.0 km
- August 7, 2026 · score 43 · 9.8 km
- August 14, 2026 · score 43 · 10.2 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 37 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 41.7945, -90.8072 |
| Nearest City | Davenport (36 km) |
| Urban exposure index (PEI) | 264.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-20T10:12:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.489abdc3ab65342812128f2cc16e27c7d1df1a2a.001.1 |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-09-20T10:12:00.000Z.
First archived: 2026-09-20T10:18:19.893Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-20T10:39:56.482Z · data_change
Index 37 → 37; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Delaware, IA; Dubuque, IA; Jackson, IA; Jones, IA; Jo Daviess, IL; De Kalb, IL; La Salle, IL; Lee, IL; Benton, IA; Cedar, IA; Iowa, IA; Johnson, IA; Jones, IA; Linn, IA and 2 more areas |
| Headline | Flash Flood Warning issued September 20 at 5:12AM CDT until September 20 at 11:15AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-09-20T11:15:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.489abdc3ab65342812128f2cc16e27c7d1df1a2a.001.1","noaa_urn:oid:2.49.0.1.840.0.9187f19ef153f7bf87c1933c9607e3ec98c347ef.001.1","noaa_urn:oid:2.49.0.1.840.0.02b16f73f62ca5283e0b1dec0725119aa43c22ed.001.1","noaa_urn:oid:2.49.0.1.840.0.8c1a218f27a7e50e9da9176f59e6741e526b2ac2.001.1","noaa_urn:oid:2.49.0.1.840.0.8cdf7c73dc7b89b5ebc6573a5d005971c8c6596c.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 64 |
| Spc Location | Muscatine |
| Spc County | Muscatine |
| Spc State | IA |
| Spc Comments | Measured with a handheld anemometer. (DVN) |
| Iem TypeSummary | R |
| Iem Magnitude | 2.41 |
| Iem Unit | Inch |
| Iem City | 2 NNE Credit Island |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
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